v.包以外壳（结壳）；装饰外层
Salt from the sea had encrusted on the dry sand. 海水中的盐分在乾燥的沙子上结成硬皮。
Green weed and grey barnacles encrust every part under the sea. 水下的部分则覆满了绿色的海藻和灰色的藤壶。
